Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	13060
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	90000
1993	54000
1994	0
1995	0
1996	0
1997	0
1998	0
1999	38000
2000	0
2001	0
2002	0
2003	0
2004	10000
2005	2494
2006	12400
2007	0
2008	75300